It works effectively against dandruff. I don't see or have flakes, nor does my head itch.
To achieve this good result, two washes are required. The first one removes the "first" greasiness, and the second one creates a rich lather and cleans deeply both the scalp and the hair. In fact, it is squeaky clean afterwards.
A very small amount is enough, so it definitely lasts me 4-5 months.
Personally, I love its scent.

It is very good for dry skin and dandruff, but not at all for oiliness. While I wash my hair and it is clean and shiny, within 24 hours it becomes oily.

It is the best shampoo I have tried for oily hair. I have been using it for the past year and I am completely satisfied. It also leaves the hair looking beautiful.